Add Entries to a Pod's /etc/hosts with HostAliases

To add host to /etc/hosts file inside the container, you can define the hosts aliases inside your deployment yaml file.

For example like the following yaml file:

apiVersion : apps/v1
kind: Deployment
metadata:
    name: "backend-cluster"
spec:
    replicas: 1
    selector:
    matchLabels:
        app: "backend"
    template:
    metadata:
        labels:
        app: "backend"
    spec:
        containers:
        - name: "backend"
        image: "exampleregistry.gcr.io/backend"
        ports:
        - containerPort: 80
        hostAliases:
        - hostnames:
        - "www.example.com"
        ip: "10.0.2.4"

The important part is hostAliases:

...
        hostAliases:
        - hostnames:
        - "www.example.com"
        ip: "10.0.2.4"

Keep going.